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1. 发明申请

WO2008070671A3 METHOD FOR OPTIMUM THRESHOLD SELECTION OF TIME-OF-ARRIVAL ESTIMATORS 审中-公开
标题翻译：最佳阈值选择时间估计器的方法
公开(公告)号：WO2008070671A3
公开(公告)日：2008-08-28
申请号：PCT/US2007086392
申请日：2007-12-04
申请人： NTT DOCOMO INC , CHONG CHIA-CHIN , WATANABE FUJIO
发明人： CHONG CHIA-CHIN , WATANABE FUJIO
IPC分类号： H04B7/212
CPC分类号： G01S5/0221 , H04W64/006
摘要： The following invention relates to geolocation technology. In particular, the proposed method can be used to determine the optimum threshold value that minimizes the estimation error. The proposed method also allows the threshold value to be varied adaptively according to the signal-to-noise ratios (SNRs) under consideration. This is to ensure that the optimum threshold value is being selected under all channel conditions i.e., both line-of-sight (LOS) and non-LOS (NLOS) scenarios. Additionally, the proposed method is generic and system independent in which it can be applied to both coherent (e.g., match filter (MF)) and non-coherent receivers (e.g., energy detector (ED)).
摘要翻译：以下发明涉及地理定位技术。特别地，所提出的方法可以用于确定最小化估计误差的最佳阈值。所提出的方法还允许根据所考虑的信噪比（SNR）自适应地改变阈值。这是为了确保在所有信道条件即视线（LOS）和非LOS（NLOS）场景下选择最佳阈值。另外，所提出的方法是通用和系统无关的，其中它可以应用于相干（例如，匹配滤波器（MF））和非相干接收机（例如，能量检测器（ED））。

2. 发明申请

WO2008156909A3 A METHOD AND SYSTEM FOR JOINT TIME-OF-ARRIVAL AND AMPLITUDE ESTIMATION BASED ON A SUPER-RESOLUTION TECHNIQUE 审中-公开
标题翻译：基于超分辨率技术的接合时间和幅度估计的方法和系统
公开(公告)号：WO2008156909A3
公开(公告)日：2009-03-12
申请号：PCT/US2008060999
申请日：2008-04-21
申请人： NTT DOCOMO INC , CHONG CHIA-CHIN , WATANABE FUJIO , INAMURA HIROSHI
发明人： CHONG CHIA-CHIN , WATANABE FUJIO , INAMURA HIROSHI
IPC分类号： G01S3/00
CPC分类号： H04L25/0202 , G01S3/043 , G01S5/0215 , G01S5/0221 , G01S11/02 , H04B1/7105 , H04B1/7107 , H04B1/7115
摘要： In a geolocation application, a method is provided to jointly estimate the time-of-arrival (TOA) and the amplitude of a received signal based on super-resolution technique. The super-resolution joint TOA-amplitude estimators are provided based on either the expectation-maximization (EM), parallel-interference-cancellation space-alternating generalized expectation maximization (PIC-SAGE) or serial-interference-cancellation SAGE (SIC-SAGE). The SIC-SAGE estimator minimizes the ranging estimation error especially under a non-line-of-sight (NLOS) condition. The SIC-SAGE estimator is a simplified version of the maximum likelihood estimator with more stable performance in a multipath rich environment, such as the ultra-wideband (UWB) based applications. These techniques provide the following benefits: 1) it is generic, so that signal processing can be deployed on both time-domain (e.g., UWB impulse-radio) and frequency-domain (e.g., multi-band orthogonal frequency-division multiplexing (MB-OFDM)) based transceiver schemes and applicable for both UWB and non-UWB systems; 2) it is robust especially under NLOS condition and multipath rich environment.
摘要翻译：在地理位置应用中，提供了一种基于超分辨率技术共同估计接收信号的时间（TOA）和接收信号幅度的方法。基于期望最大化（EM），并行干扰消除空间交替广义期望最大化（PIC-SAGE）或串行干扰消除SAGE（SIC-SAGE）提供超分辨率联合TOA幅度估计器，。 SIC-SAGE估计器最小化了测距估计误差，特别是在非视距（NLOS）条件下。 SIC-SAGE估计器是最大似然估计器的简化版本，在富路由多环境中具有更稳定的性能，例如基于超宽带（UWB）的应用。这些技术提供以下优点：1）它是通用的，使得信号处理可以在时域（例如，UWB脉冲无线电）和频域上部署（例如，多频带正交频分复用（MB -OFDM））收发器方案，适用于UWB和非UWB系统; 2）特别是在NLOS条件和多路径丰富的环境下，它是强大的。

3. 发明申请

WO2009091420A3 METHOD AND SYSTEM OF TIME-OF- ARRIVAL ESTIMATION FOR ULTRA WIDEBAND MULTI-BAND ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING SIGNALS 审中-公开
标题翻译：超宽带多频带正交分频多路复用信号的时间估计方法与系统
公开(公告)号：WO2009091420A3
公开(公告)日：2009-12-30
申请号：PCT/US2008073133
申请日：2008-08-14
申请人： NTT DOCOMO INC , XU HUILIN , CHONG CHIA-CHIN , GUVENC ISMAIL
发明人： XU HUILIN , CHONG CHIA-CHIN , GUVENC ISMAIL
IPC分类号： H04L27/28
CPC分类号： H04L25/0212 , H04B17/336 , H04B17/364 , H04L5/0007 , H04L25/0204 , H04L25/0216 , H04L25/022 , H04L25/025 , H04L27/2601 , H04W64/00 , Y02D70/00 , Y02D70/142 , Y02D70/144
摘要： A time-of-arrival (TOA) estimation method for multi-band orthogonal frequency division multiplexing (MB-OFDM) signals uses a simple equally-spaced channel model to recover the impulse response of the wireless channel, and locates the delay of the first channel path by minimizing the energy leakage from the first channel path. The TOA is estimated based on the delay. Such a method does not require channel information for TOA estimation at the receiver and does not require modification of the receiver structure. The method also avoids a sub-optimal solution known to occur in maximum likelihood (ML) estimation.
摘要翻译：用于多频带正交频分复用（MB-OFDM）信号的到达时间（TOA）估计方法使用简单的等间隔信道模型来恢复无线信道的脉冲响应，并且定位第一通过最小化来自第一通道路径的能量泄漏的通道路径。 TOA估计是基于延迟。这种方法不需要在接收机处进行TOA估计的信道信息，并且不需要修改接收机结构。该方法还避免了已知发生在最大似然（ML）估计中的次优解。

4. 发明申请

WO2008017034A3 WEIGHTED LEAST SQUARE LOCALIZATION METHOD EXPLOITING MULTIPATH CHANNEL STATISTICS FOR NON-LINE-OF-SIGHT MITIGATION 审中-公开
标题翻译：加权最小二乘定位方法为非线性降低开拓多路径信道统计量
公开(公告)号：WO2008017034A3
公开(公告)日：2008-12-04
申请号：PCT/US2007075087
申请日：2007-08-02
申请人： NTT DOCOMO INC , GUVENC ISMAIL , CHONG CHIA-CHIN
发明人： GUVENC ISMAIL , CHONG CHIA-CHIN
IPC分类号： G01S5/02 , G01S5/14 , H04W64/00
CPC分类号： G01S5/14 , G01S5/0215 , G01S5/0273 , G01S5/0278 , H04W64/00
摘要： A method mitigates NLOS conditions based on weighted least squares (WLS) technique, in which the weights are derived from multipath components (MPCs) of the received signals. The weighting methodology can be used with both linear and non-linear least squares models, as well as different other NLOS mitigation schemes, such as residual based algorithms or maximum likelihood techniques.
摘要翻译：一种方法基于加权最小平方（WLS）技术来减轻NLOS条件，其中权重是从接收信号的多路径分量（MPC）导出的。加权方法可以用于线性和非线性最小二乘模型，以及不同的其他NLOS抑制方案，如基于残差的算法或最大似然技术。

5. 发明申请

WO2008017032A2 ITERATIVE METHOD FOR JOINTLY ESTIMATING TIME-OF-ARRIVAL OF RECEIVED SIGNALS AND TERMINAL LOCATION 审中-公开
标题翻译：对接收到的信号和终端位置进行连续估计的迭代方法
公开(公告)号：WO2008017032A2
公开(公告)日：2008-02-07
申请号：PCT/US2007075082
申请日：2007-08-02
申请人： NTT DOCOMO INC , GUVENC ISMAIL , CHONG CHIA-CHIN
发明人： GUVENC ISMAIL , CHONG CHIA-CHIN
IPC分类号： G01S5/02 , H04W64/00
CPC分类号： G01S5/0215 , G01S5/0273 , G01S5/06 , G01S5/14 , H04W64/00
摘要： A method for mitigating NLOS effects in a localization system uses both multipath channel characteristics and information from the mobile network. The method iteratively estimates the first arriving path of the received signals and the terminal location, with the estimate of the terminal location improving the estimate of the first arriving path, and vice versa. Initially, a peak selection method determines a rough time-of-arrival (TOA) for a signal received at each of a number of different fixed terminals (FTs). An estimate of the location of the mobile unit is then provided (e.g., based on a least-squares (LS) triangulation). If the residual error is unsatisfactory, the TOAs are refined, using a search-back algorithm, which searches back from the strongest paths of the received signals. The new TOAs are used to refine the estimate of the location of the mobile terminal. In addition, the parameters of the search-back algorithm (e.g., a search-back threshold) may be modified for greater accuracy in the estimated first path. The first arriving path estimate and the location estimate are iterated until convergence (e.g., the residuals are within a tolerance) or until a termination condition is reached, usually controlled by the thresholds setting.
摘要翻译：用于减轻定位系统中的NLOS效应的方法使用来自移动网络的多径信道特征和信息。该方法迭代地估计接收信号和终端位置的第一到达路径，其中终端位置的估计改善了第一到达路径的估计，反之亦然。首先，峰值选择方法确定在多个不同固定终端（FT）中的每一个处接收到的信号的粗略到达时间（TOA）。然后提供移动单元的位置的估计（例如，基于最小二乘法（LS）三角测量）。如果剩余误差不能令人满意，则使用搜索回溯算法来改进TOA，该算法从接收到的信号的最强路径中回溯。新的TOA用于改进移动终端位置的估计。此外，可以在估计的第一路径中更精确地修改搜索返回算法的参数（例如，搜索返回阈值）。迭代第一到达路径估计和位置估计直到收敛（例如，残差在容差内）或直到达到终止条件，通常由阈值设置来控制。

6. 发明申请

WO2008017033A3 LINE-OF-SIGHT (LOS) OR NON-LOS (NLOS) IDENTIFICATION METHOD USING MULTIPATH CHANNEL STATISTICS 审中-公开
标题翻译：使用多通道通道统计信号的信号线（LOS）或非失效（NLOS）识别方法
公开(公告)号：WO2008017033A3
公开(公告)日：2008-12-04
申请号：PCT/US2007075084
申请日：2007-08-02
申请人： NTT DOCOMO INC , GUVENC ISMAIL , CHONG CHIA-CHIN
发明人： GUVENC ISMAIL , CHONG CHIA-CHIN
IPC分类号： G01S5/02 , H04W64/00
CPC分类号： G01S5/0215 , G01S5/14 , H04W64/00
摘要： Non-line-of-sight (NLOS) identification and mitigation are carried out in a wireless positioning system based on channel statistics derived from multipath components of a received signal. The statistics may be based on the kurtosis (210), the mean excess delay sprea (220), or the root mean square delay spread (230). The results are justified using IEEE 802.15.4a ultrawideband channel models. Amplitude and delay statistics based on the IEEE models are shown to be log-normal random variables. A joint likelihood ratio test (260) is presented for the LOS and NLOS identification.
摘要翻译：基于从接收信号的多径分量导出的信道统计，在无线定位系统中执行非视距（NLOS）识别和减轻。统计可以基于峰度（210），平均超额延迟波形（220）或均方根延迟扩展（230）。结果证明了使用IEEE 802.15.4a超宽带信道模型。基于IEEE模型的幅度和延迟统计显示为对数正态随机变量。针对LOS和NLOS识别提出了联合似然比检验（260）。

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